flight-cli

Use when a user asks to find flights, search airfare, compare prices across dates, or invoke the `flight` CLI. Translates intent (origin, destination, dates, constraints like alliance / cabin / duration / layovers / region-rather-than-airport) into the right `flight search` / `calendar` / `detail` invocation with correct `--routing`, `--extension`, `--backend`, and multi-airport args. Provides Matrix's routing language, extension codes, and IATA metro/region groupings — knowledge that's not in `flight --help`.